The white toothbrush-heads of Apple’s Airpods have become an iconic new technology, and are to be seen everywhere this year, having sold 28 million worldwide.

But could wireless Bluetooth headphones such as Airpods pose a cancer risk?

A group of 250 experts have signed a United Nations and World Health Organisation expressing ‘serious concern’ about the risks of Airpods and similar wireless headphones, as well as other wireless devices.

Devices such as Airpods comply with legal limits for electromagnetic frequency (EMF) radio waves – but the 250 experts worry that the guidelines are too lax.

Jerry Phillips, a professor of biochemistry at the University of Colorado said that wireless headphones pose a particular concern due to the fact they’re worn in the ear canal.